PrintPreview Method
Switches the view to print preview.
Note In addition to using the PrintPreview method, you can set the PrintPreview property to True or False to switch to or from print preview, respectively. You can also change the view by setting the Type property for the View object to wdPrintPreview.
expression.PrintPreview
expression Required. An expression that returns an Document object.
Example
This example switches the active document to print preview if it's currently in some other view.
If Application.PrintPreview = False Then
ActiveDocument.PrintPreview
End If